EARTH BATTERY EXPLAINED; IT'S SCIENCE

An earth battery is a pair of electrodes made of two dissimilar metals, such as iron and copper, which are buried in the soil or immersed in the sea. Earth batteries act as water-activated batteries. If the plates are sufficiently far apart, they can tap telluric currents .
earth is a battery of stored chemical energy where the planet is the cathode (stored organic chemical energy) and space is the anode (equilibrium). We call this the earth-space battery.